초록 ▼

A method of reducing image artifacts in tomographic, projection imaging systems due to periodic motion of the object being imaged includes the acquisition of a signal indicative of the periodic motion. This signal is used to identify a quiescent period in the periodic motion so that the acquisition

A method of reducing image artifacts in tomographic, projection imaging systems due to periodic motion of the object being imaged includes the acquisition of a signal indicative of the periodic motion. This signal is used to identify a quiescent period in the periodic motion so that the acquisition of projection data may be coordinated to be centered within the quiescent period. The sequence of the angles at which projection data is acquired is controlled so that the primary axis of periodic motion is perpendicular to the axis of projection at the center of the quiescent period. Multiple periodic signals may be coordinated by awaiting their best alignment over a fixed number of cycles of one of the periodic motions.

대표청구항 ▼

A method for reducing image artifacts in an image object resulting from periodic motion of the object, where the image is produced from a projection set taken continuously during an acquisition period along a plurality of projection axes about the object, the periodic motion having a quiescent perio

A method for reducing image artifacts in an image object resulting from periodic motion of the object, where the image is produced from a projection set taken continuously during an acquisition period along a plurality of projection axes about the object, the periodic motion having a quiescent period during which the periodic motion is at a minimum, the quiescent period being less than the acquisition period, said method comprising: producing a signal indicative of said periodic motion; producing a series of reference signals which indicate a pre-established point in each of a series of said periodic motions; relating the quiescent period to the pre-established point in each reference signal; starting the acquisition period at a time related to the reference signal so that the acquisition period for the projection set is centered around the quiescent period.